Preparation method of tubular membrane with composite structure

A composite structure and tubular membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve problems such as difficult distribution and expensive inorganic materials, so as to simplify the membrane preparation process and reduce the economic cost. cost, effect of avoiding layering

Active Publication Date: 2019-04-19
JIANGSU KAIMI MEMBRANE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

First of all, there are differences in performance between inorganic materials and organic materials. Inorganic materials are easy to form agglomerates in polymer solutions, and it is difficult to effectively and evenly distribute them.
Secondly, the price of inorganic materials with high precision and small particles is relatively expensive. How to effectively realize the most economical dosage and maximum functionality of inorganic materials in hybrid membranes is the key technical problem to be solved in the preparation of organic-inorganic hybrid membranes.

Method used

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  • Preparation method of tubular membrane with composite structure
  • Preparation method of tubular membrane with composite structure
  • Preparation method of tubular membrane with composite structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] According to mass percentage, with 17% PVDF, 74% DMAc, 6% PVP K12 and 3% LiCl, at 70 ℃ with a stirring speed of 400rpm stirring for 18h, to obtain the functional layer casting solution; according to mass percentage, 15% of PVDF, 5% of PVP K12, 2.5% of LiCl and 77.5% of DMAc were mixed, and stirred at 70°C for 18 hours at a stirring speed of 400rpm to obtain the supporting layer casting solution; the functional layer casting solution and the supporting layer After the casting solution is left to stand for degassing for 24 hours, it is placed on a tube-type film scraping machine together with the pretreated non-woven roll tube, and the functional layer casting solution and the supporting layer casting solution are passed through the above-mentioned scraping head 100, Coating and film making are carried out at 50°C, the feed rate of the supporting layer casting solution is 3ml / min, the feeding rate of the functional layer casting solution is 0.8ml / min, the coiling speed is ...

Embodiment 2

[0059] According to mass percentage, 20% PAN, 2.5% PEG 400, 77.5% DMAc were insulated and stirred at 70°C for 24h at a stirring speed of 400rpm to obtain a functional layer casting solution; according to mass percentage, 17% PAN, 3% of PVP K15, 2.5% of LiCl and 77.5% of DMAc were mixed, and stirred at 70° C. with a stirring speed of 400 rpm for 24 hours to obtain the supporting layer casting solution; the functional layer casting solution and the supporting layer casting solution were statically After defoaming for 24 hours, place the pretreated non-woven roll tube on a tube-type film scraping machine, pass the functional layer casting solution and the support layer casting solution through the above-mentioned scraping film head 100, and coat at 50°C. For film coating, the feed rate of the supporting layer casting solution is 3.5ml / min, the feeding rate of the functional layer casting solution is 1.0ml / min, the tube rolling speed is 3.0m / min, and the inner diameter of the non-w...

Embodiment 3

[0065] By mass percentage, 2% TiO 2 Mix with 66.5% DMAc, ultrasonically disperse at room temperature for 1 h, add 23% PES, 3.5% SPSf, 2.5% PVP K30 and 2.5% PEG 400, keep stirring at 70°C for 18 h at a stirring speed of 300 rpm, Obtain the functional layer casting liquid; according to the mass percentage, mix 17% PES, 1.5% PVP K30, 1.5% PEG 400 and 80% DMAc, keep stirring at 70°C for 24h at a stirring speed of 400rpm to obtain a support layer Casting solution; the functional layer casting solution and the supporting layer casting solution were left to stand for degassing for 24 hours, and then placed on the tube-type film scraping machine together with the pretreated non-woven roll tube, and the functional layer casting solution and The supporting layer casting solution passes through the above-mentioned scraping film head 100, and is coated and formed at 50°C. The feeding rate of the supporting layer casting solution is 4.0ml / min, and the feeding rate of the functional layer c...

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Abstract

The invention discloses a preparation method of a tubular membrane with a composite structure. The method comprises the steps that (1), a high polymer is taken as a substrate, a supporting layer casting solution and a functional layer casting solution are prepared by using the high polymer, a solvent and added components respectively; (2), deaeration is conducted on the supporting layer casting solution and the function layer casting solution, and coating is conducted on a tubular membrane scrapper to form a pre-phase-inversion membrane; (3), the pre-phase-inversion membrane is soaked into a coagulating bath after pre-evaporation to complete the phase-inversion process to form the organic tubular membrane. A polymer material of the organic tubular membrane is provided with a composite structure, the polymer material with relatively low price and excellent performance is taken as a supporting layer to achieve the effect of mechanical supporting and improving permeable throughput, and apolymer material with high performance or special performance or a hybrid molecular material containing a nano particle material is taken as a separated functional layer to achieve the effect of improving the selectivity and reducing economical cost.

Description

technical field [0001] The invention belongs to the technical field of membranes, in particular to a method for preparing an organic tubular membrane with a composite structure. Background technique [0002] The organic tubular membrane refers to a circular tubular separation membrane obtained by scraping a semipermeable membrane on the inner or outer layer of a cylindrical support. There are many methods and combinations for the structure of the support and the composite method of the separation layer. In the separation process, the inorganic polymer material layer is the functional layer to realize the separation function, and the non-woven fabric tube provides mechanical support performance. Compared with the inorganic tubular membrane, the organic tubular membrane belongs to the composite membrane in the organic membrane, which is composed of a high-strength support layer and a high-precision separation layer. The preparation process is to dissolve the organic polymer an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/06B01D69/12B01D69/04B01D67/00
CPCB01D67/0011B01D67/0013B01D69/04B01D69/12B01D71/06
Inventor 彭娜周龙坤王怀林关晓琳时良晶林玉聪
Owner JIANGSU KAIMI MEMBRANE TECH
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